Explore: All CBSE Class 12 chapters · CBSE Class 12 Biology PYQs · CBSE Class 12 hub · Syllabus & pattern · Class 12 2026
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Organisms and Populations PYQs (previous year questions) for CBSE Class 12: Organisms and Populations (Biology) had 14 questions across the 50 official CBSE Class 12 papers we tagged (2016–2026), and appeared in 10 of them. Asked in 10 of 10 years. The concepts asked in the most papers: Population Interactions, Population Growth, Age Pyramids.
Year-wise question count
Asked in 10 of 10 years.
Most-asked concepts
Sorted by the number of papers a concept appeared in.
| Concept | Questions | Papers | Years |
|---|---|---|---|
| Population Interactions | 4 | 4 | 2024, 2023, 2020, 2016 |
| Population Growth | 3 | 3 | 2022, 2017, 2016 |
| Age Pyramids | 2 | 2 | 2023, 2020 |
| Competition | 1 | 1 | 2026 |
| Conformers and Regulators | 1 | 1 | 2017 |
| Population Attributes | 1 | 1 | 2025 |
| Population Density | 1 | 1 | 2019 |
| Responses to Abiotic Factors | 1 | 1 | 2018 |
How to practise Organisms and Populations PYQs
- Start with the concepts at the top of the table. They have come back the most.
- Solve one year’s Organisms and Populations questions from the official PDF against the clock, then check the answer listed below.
- Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
- Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.
Questions by year
Each line gives the question number and paper, type, concept, our one-line summary, with a link to the official PDF.
CBSE Class 122026
- Q.29 (Biology (57/1/1)) · Case-based · Competition: Barnacle range expansion: competitive exclusion and resource partitioning PDF
CBSE Class 122025
- Q.30 (Biology (57/1/1)) · Case-based · Population Attributes: Monarch butterfly defence, population density sums and measuring methods PDF
CBSE Class 122024
- Q.28 (Biology (57/1/1)) · Short answer · Population Interactions: How Ophrys ensures pollination by one bee species; co-evolution PDF
CBSE Class 122023
CBSE Class 122022
- Q.5 (Biology Term 2 (57/1/1)) · Short answer · Population Growth: Carrying capacity on a logistic curve and forces that shape it PDF
CBSE Class 122020
CBSE Class 122019
- Q.27 (Biology (57/1/1)) · Long answer · Population Density: Define population; why population size fluctuates PDF
CBSE Class 122018
- Q.26 (Biology (57/1)) · Long answer · Responses to Abiotic Factors: Regulate, conform, migrate, suspend; compute butterfly death rate PDF
CBSE Class 122017
CBSE Class 122016
Other Biology chapters
- Reproduction in Organisms PYQs
- Sexual Reproduction in Flowering Plants PYQs
- Human Reproduction PYQs
- Reproductive Health PYQs
- Principles of Inheritance and Variation PYQs
- Molecular Basis of Inheritance PYQs
- Evolution PYQs
- Human Health and Disease PYQs
- Strategies for Enhancement in Food Production PYQs
- Microbes in Human Welfare PYQs
- Biotechnology: Principles and Processes PYQs
- Biotechnology and its Applications PYQs
- Ecosystem PYQs
- Biodiversity and Conservation PYQs
- Environmental Issues PYQs
FAQ
How many Organisms and Populations questions come in CBSE Class 12?
In the official papers we tagged: 1 in 2026, 1 in 2025, 1 in 2024, 2 in 2023, 1 in 2022, 2 in 2020, 1 in 2019, 1 in 2018, 2 in 2017 and 2 in 2016. That is 14 questions in all, about 5% of Biology.
Which Organisms and Populations topics repeat in CBSE Class 12?
Asked in the most papers: Population Interactions, Population Growth, Age Pyramids. The concept table lists every one with its count.
Are these official CBSE Class 12 questions?
Yes. Every question is from an official CBSE Class 12 paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.